Strabo Geography 2.5.9

[9] If, then, to the distance between Rhodes and the Dnieper be added four thousand stadia north of the latter place, the whole would come to 12,700 stadia; and since from Rhodes to the southern limit of the habitable earth there are 16,600 stadia, its total breadth from north to south would be under 30,000 stadia. ¹ Its length from west to east is stated at 70,000 stadia, the distance being measured from the extremities of Iberia to those of India, partly over the land and partly across the sea. That this length is contained within the quadrilateral aforesaid, is proved by the proportion borne by these parallels to the equator. Thus the length of the habitable earth is above twice its breadth. It has been compared in figure to a chlamys, or soldier’s cloak, because if every part be carefully examined, it will be found that its breadth is greatly diminished towards the extremities, especially in the west.